I agree 16:1 is way to much. 32:1 is perfect I would recommend Yamalube 2R.
You should always let the motor warm up even after broken in. Start with a fresh batch of Gas and Oil. Let it warm up for a couple of minutes. Once warmed up to about 160 to 170. I take it out for a spin a couple of minutes at 1/4 to 1/2 throttle. Once your done , then its when it gets FUN and you WOT. I have done 4 of my setups this way and I haven't had any problems. The main thing is that everything is in within tolerance.